Window-lock.



C. NELSON. wmnow LOCK.

11915. 1,191,815. Patented July 18, 1916.

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CARL- NELSON, or BROCKTON, rinssAcifusnr'rs.

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Specification of Letters Patent. v

Patented July 18,1'9Lffi Application filed November 9, 1915. Serial No.66,546;

[b all whom it may concern Be it known that I, CARL NELSON, a citizen ofthe United States,'residing at Brockton, in the county of Plymouth andState of lliassachusetts, have invented certain newand usefulImprovements in Window-Locks; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to new and useful improvements in window locksand the principal object of the invention is to provide a sash lockwhich is adapted to be attached to a window of the ordinary constructionwithout in any way changing the same.

Another object of the invention is to provide a sash lock which isarranged to secure both the upper and lower sashes against movement andto frustrate any attempt made by unauthorized persons to open thewindow.

Still another object of the invention is to provide a simply constructeddevice which is adapted to be adjusted to fit win dows of differentsizes without in any way changing the construction thereof.

With these and other objects in view, the invention consists in thenovel combination and arrangement of parts which will be fully set forthin the following specification and accompanying drawings, in which:

Figure 1 is a perspective view illustrating the device in use, and Fig.2 is a sectional view through Fig. 1.

Referring to the drawings, the numeral 1 designates the lower sash ofthe window while the numeral 2 designates the upper sash. These sashesare mounted to slide beside each other in the usual manner and securedto the upper side of the upper rail of the lower sash is the base plate3 of the device. The base plate is provided at its rear edge with aplurality of spaced notches at forming the shoulders 5 against which therear end of the locking arm abuts. Secured to the rear end or formedintegral therewith whichever is the most preferred, are the upwardlyextending arms 6 provided with the forwardly arched arms 7 which extendat parallel relation over the upper face of the plate 3. These arms 7form guards for retaining the locking arm in place.

The locking arm above referred to is des ignated by the numeral 8 and isprovided at its rear end with the downwardly extending tongue 9 which isadapted to engage n the notches 4 and against the shoulders 5'. A pairof laterally extend ing projections 10 are formed at the point where thetongue 9 joins the arm 8 and these extensions engage the under sides ofthe hooked arms 7 as clearly shown in the drawing. The forward end ofthe arm 8 is provided with a suitable head or shoe 11 I having afriction pad 12 formed at the outer face thereof which friction pad ispreferably curved as illustrated in the drawings and is adapted toengage against the inner face of one of the side rails of the uppersash.

It will be apparent from the foregoing that in use the plate 3 issecured to the upper side of the upper rail of the sash by suitablescrews or in any other suitable manner and the arm 8 is adjusted in thenotches 4 so that the friction pad will ongage the upper sash 2. It willthus be seen that slight variations of thickness of the upper sash maybe allowed for through the adjustment of the tongue 9 in the notches andupon upward movement of the lower sash or downward movement of the uppersash, it will be apparent that the friction pad 12 will bind against theside rail of the upper sash thereby exerting pressure on the arm 8 whichin turn bears against the shoulders 5 and thus lock the window againstmovement. It is to be understood that if so desired in order to furtherfacilitate the operation of the device a suitable retractile coil springmay be connected between the arm 8 at a point near its outer end and theplate 3 at a point near its inner edge to exert pull on said arm andnormally hold the friction pad in engagement with the upper sash 2.

It is to be understood that when the lock is not in use the locking armcan be lifted and held in upright position by the arms or guards 7 dueto the frictional engagement of the projections 10 with the under sidesthereof.-

While in the foregoing there has been shown and described the preferredembodiment of this invention, it is to be understood that such changesmay be madein the combination and arrangement of parts as will fallwithin the spirit and scope of the app n d claim What is claimed is Awindow lock comprising a plate provided with a plurality of spacedrecesses, a locking arm having an angular down-turned 5 end adapted toengage said recesses when said lock is in use, a pair of upwardlyextending arms secured to the rear end of said plate, the free terminalsof said arms being provided with arched arms extending 10 forwardly overthe face of said plate in parallel relation, and a pair of laterally extending projections formed on said arm at opposite sides thereof adaptedto engage said arched arms thereby preventing the angular end fromriding outof said notches 15 and forming a means to swing said arm outof engagement with a window.

In testimony whereof I aflix my signature in presence of two witnesses.

CARL NELSON.

Witnesses:

CHARLES A. NORLING, CARL D. FYHR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

